I haven't seen much of the Jackass television series from MTV, or the original movie when it was released in 2002. Nonetheless I shall unabashedly say that I had a good time watching Lamb TV, which people say compares and will only appeal to those who have a thing for low browed humor.
Lamb Television consists of various episodes of skits, ranging from the vulgar to the dangerous, featuring a host of people who are willing to capture on film some ridiculous, nonsensical scenarios and candid camera-ish funny moments to either humiliate, or just have plain fun. The gags range from simple masturbation spoofs, to elaborate rouses on the unsuspecting public.
Be prepared for plenty of scenes of tomfoolery. If it's not your kind of thing and you dismiss toilet humor easily, then steer clear of this comedy anthology. There's no joke that cannot be made here, no holds barred.
If you want to unwind after a hard day's work, in need of some mindless fun and comedy, and not bother about plot or characters, then Lamb TV is an automatic choice. Just don't repeat what they do, in your real life.